Duplex riveting machine



Filed Dec. 30, 1940 2 Sheets-Sheet l A 9 gwwm Mi LUEE/AWXRD J \20 32' 5 Z)? jig Hi 54 my in,

May 23, 1944. L. A.- WARD 2,349,529

I DUPLEX RIVETING MACHINE Filed De'c. 50, 1940 2 Sheets-Sheet 2 Patented May 23, 1944 UNITED s 'rzwas, PATENT OFFICE V 2,349,529 V nnr'nnxinrvlzrma MACHINE;

Loyd" A: Ward; Jackson, Mich.,, assignor to Tomkins-Johnson Coinpany, Jack'sompMich, a

corporation of Michigan AppiicatiornDecernher 30, 19.40, .SeriaiNo. 372,250

s' olanns. (o1. 78-48) The :present, invention; relates;to riveting; ma;- chines and more particularly to .riv eting lmachine s wherein the rivet is employed topunchthe holein the metal in which'the' rivet is disposed. for head mg.

Heretoforehollowt rivets have been employed for. punching. their holesthrough .the, parts :to be secured together. However. so. far. as; is known such machines have beenlimited .to operationon relatively. soft materials such aspaper and'leather. The present invention isdesigned to rivetmtal with solidirivets although the structure is equally usable forhollow rivets.

Objectofthe invention is to employa rivet to'punch its hole to the work tobe riveted? Another object of'the invention .iS'tO provideja die and setforcooperating'vvith'the rivet to punch the work and head-therivetrespectively.

Still another object of the invention is to:pro"-' vide a machine of'the character described wherein the die and set are automatically indexed'intoand out of operativep'ositionrespectively during the operation of the machine.

These-andother-objects-residing inthearrange ment; combination and constructionofparts will be apparent from the following"specification whentaken with the-accompanying drawings;'in which Fig. 1 isafront-elevation of-aportion'of'a rivet-- ing-machine'according to the present invention;

Fig. 2 isan elevationof the" right sidecf' the structure as viewed in Fig. 1-,

Fig; 3..is' asectin on th'e li-ne-III'-III of Figs 2 Fig; 5: is. a. section on the: 1ineaV.-'-V of Fig.1.

art. The frame I also slidablysupports avram. 5- towhich is connecteda ho1der'6 and a.-,set;1., 1

Theholder fiisprovided withzlegs, 8;.and. 9-,- the: set .'I' being securedin the; leg 8 andma; female; punching die III being: secured in the le .;5.-. Theare I0 is provided with van interior passageway. I-I

communicating with an opening. I2 in one.side;of..

the leg 9 for discharging punched slugs.

The holder 6 has .projectingtherethrough mugportingpin I 31whi'ch ispivoted in ears. I 'I a'nd I3. dependingfroma slide I9"slidably arrangedfabout' the ram I as shown particularly in Fig? 51 The:

snugly engaging with a squaredopening 23in .the holder 6. The purpose of the squared portion 22 and the squared, opening-23 is:to rigidly'secure theholder 6 and. thepin I3.together for simultaneousoscillation. Secured. to. a'squared extension 24 of thepin .I3v is an indexingmember 25 having a squared opening; 26 therein with which. the squared extension 24 cooperates for providing simultaneous. oscillation of the pin I3 withtheindexingmember 25. Thus rotary movement of the indexing member 25I-is transferred throughthe pin I3 to the holder 6;

For'thepurpose of. facilitatingthe assembly of the pin l3 and its associated parts, the end thereof opposite the extension, is reduced in diameter W into a longitudinal slot 34in-theram 5 and is pro:

vided with a rectangular opening-35 best shown in Fig. 3. Adjacent the-slot35' the ram 5 is provided with a recess 33, shown particularly in Fig. 5',

. communicating-with.one'sideof theJram 5.. A'he'lipin -I 3'is'provided witha squaredportion' Hf-inter mediate-its-"ends' shown particularly irrFige 4' for" cal spring 3.1 isdisposed'inithe. slota35 in thelink 3| and. at thersame; time;in.the recess-36in the.

ram 5,- the parts being arranged. sdthat .thespring 3'I bears;againstqtheabottom of; the recess36 and. against the .top' ofthe slot 35.so that the link.3I is resiliently; urged upwardlyg. The. upward force.

transferred-to theilink 3l by the spring3I is ex.- ertedagainstthepin I3;to draw-the slide I9 and with it the holder Gupwardly. As viewed in Fig. 1 this resilient upward forceholds the side surface.

29. ofthe leg,9. of the holder. 6 against the bottom facew3fl, of theram 5. Itwill beunderstood that.

should the holderItbe rotated. aboutthe pin. I3 until vtheside surfaces of'the leg 8 of the holder.

31s in ahorizontalposition. as viewed in Fig. 1,.

' andpassesdeadjcenterposition. It willalsob'e.

obvious that'when the'side surface 28 is in a hori zontal position, the female punching die Illwill be directed downwardly in position for cooperation with therivet3:

For" swingingthe holder Ii from one position" to another there are provided abutments MI and 42 for alternately engaging with hooks 43 and 44 respectively on the indexing member 25. The abutments 4| and 42 are pivoted at points 45 and 46 respectively, to a plate 41 suitably secured to the frame I. Abutments 4| and 42 are resiliently held in the position shown in Fig. 1 by extensible and contractable links 48 pivoted at the points 49, respectively, tothe frame I. Each line 48 consists of a rod 51! axially s'lidable in a tube Each rod 50 is provided with spaced nately moved respectively from inoperative to operative to inoperative position. It is preferred that the tripping mechanism for the riveting machine according to the present invention be arranged to provide the ram 5 with two downward strokes, one for punching and the other for up-\ setting, although it will be obvious that a separate tripping impulse maybe given for each downward stroke of the ram 5. I

Having thus described my invention, what I desire to secure by Letters Patent and claim is:

shoulders 52 against which are urged by a helical spring 53 loose collars 54. the collars 54 also are urged againstexternally theaded nuts 55 screwed into' the ends of 'the One rod 55 is connected to the abuttubes 5|. ment 42 and the other rod 55] is connected to the abutment 4| The tubes 5! are 'connected't o' the pivot points 49. It will be seen that any tendency to either extend or contract the links 43 is resisted by the springs 53.- a

The drawings show the set I in engagement with the rivet 3 having just headed the same on work 55 shown in dotted outline. As the ram 5 moves upwardly under the action of conventionaldriving mechanism not shown, the hook 44 moves into engagement with the abutment 4 2 which swings the indexing member 25'to the right as viewed in Fig. 1. As the indexing member 25 swings to the right it will draw the abutment 42'inwardly toward the axis of the ram 5 at the same time extend its extensible and'contractable link 48. When the peak 40 on, the holder 5 passes the .dead'center position sliding across the bottom face-3B of theram 5, the resiliency of thespring 31' will causethe holder 5 to continue rotating to the right until the surface 28 of the leg 8 is against the bottom face 30 of the ram 5. As the indexing member 25 swings tothe right, the hook 44 will disengage from the abutmentAZ. permitting the abutment 42 to resume its neutral position and the indexing member 25 will assume the position shown in dotted outline in Fig.- l behind the abutment 4|. The die H3 is now in position for cooperation with a rivet 3 on the anvil 2. 1 Y

The rivet 3 is fed to the anvil 2 in some conventional manner andis held, thereon by the finger 4, although it will be understoodthat the finger 4 isnotanessential part of the invention. Whenthe rivet 3 is in place on the anvil 2, the work 56 is held over the rivet 3and the ram 5 is moved downwardly under the power of its actuating mechanism. The downward movement of the ram 5 drives the female die l0 into punching relation with the rivet 3, punching the rivet 3 through the work55. The punched out slugs from the work 56 go into the'internal'passage into the'die I0 and eventually pass out of the opening l2 in the side'of the leg 9 of the holder 6. -As soon as the rivet 3- has been punched throughthe work 56, the ram 'returns to its upper position swinging the indexing member 25 to the left, in the manner above described, although in'swinging from the right to the left the hook 33 is engaged "with the abutment 4|. When the indexing member 25 hasbeen swung to the left to the position shown in: full lines in' Fig. l, the set! is in position to head the rivet}. Thus when the .ram 5 comes down again the set 1 heads the'rivet 3 on the Work 56.

From the foregoing specification it will be seen that as the ram 5 reciprocates up anddown, the;

female punching die l0 and the se' t flare alter In neutral position I 1. In a machine of the character described, a

a frame, an anvil for supporting a rivet, mounted in said frame, a reciprocable ram mounted in said frame, a female die for cooperating with the rivet, a set for heading the rivet, means holding said die and set in angular relation to each other, a pivotal connection between said ram and said holder whereby said holder may be swung alternately from one position to another, die and set indexing means operatively connected to said holder and movable therewith for swinging said holder, an abutment supported withrespect to said frame on each side of said ram, said indexing means in one position having a portion in the path of which one of said abutments is disposed and its other position having a portion in the path of which the other of said abutments is disposed, whereby as said ram reciprocates, alternately one of said indexing means portions moves into engagement with one of said abutments to swing the indexing means and with it the holder in one direction, and the other of said indexing means portions moves into engagement with the other abutment to swing said indexing means and, with it said holder in the opposite direction to alternately present said die and set to the rivet.

.2. In a machine of the character described, a frame, an anvil for supporting a rivet mounted in said vframeQa reciprocable ram mounted in said frame, said ram having'a downwardly facing abutment thereon, a female die for cooperatingwith the rivet, a set for heading the rivet, meansholding said die and set in angular relation to each other, a support for said holder, means pivoting said holder to said support, means guiding said support for movement in the direction of movement of said ram, a link connected by said pivoting means to said holder, a resilient,

connection between said link and said ram to resiliently draw said holder against said abutment, said holder having two intersecting faces, either one of which'bears against said abutment under the action of said link, and means to oscillate said holder about the axis of said pivoting means to alternately dispose first one and then the other of. said faces against said abutment, whereby as said holder is oscillated said resilient connection is extended and contracted to provide with said surfaces and abutment an over-center structure, said die'and set bein so arranged with respect to saidsurfaces that when one of said surfaces is against .said abutment said die is disposed in alignment with the rivet andwhen the atheist" said surfaces is against said abutment said set dexer is moved operatively into engagement with said abutment means to oscillate said holder to alternately present said die and set to the rivet.

4. The invention as defined in claim 1 wherein the abutments comprise pivoted arms having portions for operatively engaging the indexing means, said pivoted arms being resiliently held in predetermined positions and being swingable upon operative engagement with the indexing means to follow the movement of the same in operative direction.

5. The invention as defined in claim 2 wherein the holder oscillating means comprises indexing means operatively connected to the holder for oscillation therewith, an abutment, one on each side of said ram, supported with respect to the frame, said abutments comprising pivoted arms having portions for operatively engaging the indexing means, said indexing means in one position having a portion in the path of which one of said abutments is disposed and in its other position having a portion in the path of which the other of said abutments is disposed, said pivoted arms being resiliently held in predetermined positions and being swingable upon operative engagement with the indexing means to follow the movement of the same in operative direction, whereby as said ram reciprocates, alternately, said indexing means is swung first in one direction and then in the opposite direction to alternately present said die and set to the rivet.

LOYD A. WARD. 

